/* ==========================================================================
   ALTES PROJE - HIGH-CONTRAST ARCHITECTURAL CORPORATE DESIGN SYSTEM
   Luminous White Canvas + Bold Charcoal (#1e2126) + Rich Amber Gold (#d97706)
   100% Kontrast, Kusursuz Okunabilirlik, Sıfır Karanlık/Boğucu Alan
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Space+Grotesk:wght@600;700;800&display=swap');

:root {
  --bg-page: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-card: #ffffff;
  --bg-charcoal: #1e2126;
  --bg-charcoal-deep: #141619;
  
  --text-title: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-white: #ffffff;
  
  --gold-primary: #d97706;
  --gold-hover: #b45309;
  --gold-light: #fffbeb;
  --gold-border: #fde68a;
  --gold-badge: #d97706;
  
  --border-light: #e2e8f0;
  --border-card: #cbd5e1;
  
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 4px 16px rgba(15, 23, 42, 0.06);
  --shadow-hover: 0 12px 32px rgba(15, 23, 42, 0.12);
  
  --max-w: 1240px;
  --trans: all 0.22s ease-in-out;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--trans);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

[id] {
  scroll-margin-top: 100px;
}

/* 1. ÜST BİLGİ ŞERİDİ (TOP BAR) - AYDINLIK & NET */
.topbar {
  background-color: #1e2126;
  color: #e2e8f0;
  font-size: 0.8125rem;
  padding: 10px 0;
  border-bottom: 2px solid var(--gold-primary);
}
.topbar-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}
.topbar-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #cbd5e1;
}
.topbar-link strong {
  color: #fbbf24;
}
.topbar-link:hover {
  color: #ffffff;
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #94a3b8;
}
.topbar-badge {
  background: rgba(217, 119, 6, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(251, 191, 36, 0.4);
  padding: 2px 8px;
  border-radius: 4px;
}

/* 2. ANA NAVİGASYON (BEYAZ & FERAH HEADER) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  height: 80px;
  display: flex;
  align-items: center;
}
.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand-group {
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand-logo {
  height: 52px;
  width: auto;
  display: block;
  transition: transform 0.2s ease;
}
.brand-logo:hover {
  transform: translateY(-1px);
}
.brand-sub {
  font-family: var(--font-heading);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold-primary);
  border-left: 2px solid var(--border-light);
  padding-left: 16px;
  line-height: 1.35;
  text-transform: uppercase;
}
.brand-sub span {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.68rem;
  display: block;
  margin-top: 2px;
  letter-spacing: 0.05em;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #1e293b;
  padding: 8px 0;
  position: relative;
  letter-spacing: -0.01em;
}
.nav-link:hover, .nav-link.active {
  color: var(--gold-primary);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--gold-primary);
  border-radius: 2px;
}
.btn-header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--gold-primary);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.875rem;
  padding: 11px 22px;
  border-radius: 4px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(217, 119, 6, 0.25);
  transition: var(--trans);
}
.btn-header-cta:hover {
  background-color: var(--gold-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.35);
}
.mobile-toggle {
  display: none !important;
}

/* 3. AYDINLIK & GÖRKEMLİ HERO BÖLÜMÜ */
.hero {
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  padding: 70px 0 60px 0;
  border-bottom: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 50px;
  align-items: center;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--gold-light);
  border: 1px solid var(--gold-border);
  color: var(--gold-primary);
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 6px 14px;
  border-radius: 4px;
  margin-bottom: 22px;
}
.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.3rem, 4.2vw, 3.6rem);
  font-weight: 800;
  line-height: 1.15;
  color: #0f172a;
  margin-bottom: 22px;
  letter-spacing: -0.03em;
}
.hero-title span.gold-highlight {
  color: var(--gold-primary);
}
.hero-desc {
  font-size: 1.1rem;
  color: #475569;
  line-height: 1.75;
  margin-bottom: 36px;
  max-width: 620px;
}
.hero-btns {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 46px;
}
.btn-primary-gold {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--gold-primary);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.9375rem;
  padding: 14px 28px;
  border-radius: 4px;
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.3);
  transition: var(--trans);
}
.btn-primary-gold:hover {
  background-color: var(--gold-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.4);
}
.btn-charcoal {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: #1e2126;
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.9375rem;
  padding: 14px 28px;
  border-radius: 4px;
  transition: var(--trans);
}
.btn-charcoal:hover {
  background-color: #0f172a;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.25);
}

/* HERO SAĞ TARAF: PRESTİJLİ GÖRSEL KARTI */
.hero-visual-card {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 12px;
  box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.12);
}
.hero-visual-card::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 24px;
  width: 80px;
  height: 4px;
  background: var(--gold-primary);
  border-radius: 2px;
}
.hero-img-box {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  height: 400px;
}
.hero-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.hero-visual-card:hover .hero-img-box img {
  transform: scale(1.03);
}
.hero-img-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(to top, rgba(15, 23, 42, 0.9) 0%, rgba(15, 23, 42, 0.4) 60%, transparent 100%);
  padding: 24px;
  color: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}
.img-overlay-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: #fbbf24;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.img-overlay-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
}

/* 4'LÜ METRİK ŞERİDİ - KUSURSUZ OKUNABİLİR */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 24px 32px;
  margin-top: 48px;
  box-shadow: var(--shadow-sm);
}
.stat-item {
  border-right: 1px solid var(--border-light);
  padding-right: 16px;
}
.stat-item:last-child {
  border-right: none;
  padding-right: 0;
}
.stat-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--gold-primary);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.stat-num {
  font-family: var(--font-heading);
  font-size: 1.95rem;
  font-weight: 800;
  color: #0f172a;
  line-height: 1.1;
}
.stat-num span {
  font-size: 1.1rem;
  color: var(--gold-primary);
}
.stat-label {
  font-size: 0.8125rem;
  color: #64748b;
  margin-top: 4px;
  font-weight: 500;
}

/* 4. GENEL BÖLÜM STİLLERİ */
.section {
  padding: 85px 0;
}
.section-white {
  background-color: #ffffff;
}
.section-subtle {
  background-color: #f8fafc;
}
.section-header {
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold-primary);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.85rem, 3vw, 2.5rem);
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.section-desc {
  font-size: 1.05rem;
  color: #475569;
  line-height: 1.7;
  max-width: 680px;
  margin-top: 10px;
}

/* 5. SİSTEMLER ŞARTNAME LİSTESİ (AYDINLIK & PRESTİJLİ) */
.systems-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.sys-card-row {
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--gold-primary);
  border-radius: 6px;
  padding: 28px 32px;
  display: grid;
  grid-template-columns: 0.8fr 1.6fr 1fr 0.6fr;
  align-items: center;
  gap: 26px;
  box-shadow: var(--shadow-sm);
  transition: var(--trans);
}
.sys-card-row:hover {
  box-shadow: var(--shadow-card);
  transform: translateX(4px);
  border-color: var(--gold-primary);
  border-left: 4px solid var(--gold-hover);
}
.sys-code {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gold-primary);
  letter-spacing: 0.05em;
}
.sys-name {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: #0f172a;
  margin-top: 4px;
}
.sys-desc {
  font-size: 0.9375rem;
  color: #475569;
  line-height: 1.65;
}
.sys-specs {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.8125rem;
  color: #64748b;
}
.sys-specs strong {
  color: #0f172a;
}
.btn-sys-detail {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: #1e2126;
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.8125rem;
  padding: 10px 18px;
  border-radius: 4px;
  white-space: nowrap;
  transition: var(--trans);
}
.btn-sys-detail:hover {
  background-color: var(--gold-primary);
}

/* 6. MÜHENDİSLİK & İMALAT 4 ADIM */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.process-card {
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 28px 22px;
  box-shadow: var(--shadow-sm);
  transition: var(--trans);
}
.process-card:hover {
  border-color: var(--gold-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}
.process-num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--gold-primary);
  margin-bottom: 12px;
}
.process-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 8px;
}
.process-desc {
  font-size: 0.875rem;
  color: #475569;
  line-height: 1.6;
}

/* 7. PROJELER VİTRİNİ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.proj-card {
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--trans);
  display: flex;
  flex-direction: column;
}
.proj-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--gold-border);
}
.proj-img {
  height: 240px;
  position: relative;
  overflow: hidden;
}
.proj-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.proj-card:hover .proj-img img {
  transform: scale(1.05);
}
.proj-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  background-color: rgba(15, 23, 42, 0.88);
  color: #fbbf24;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 4px;
  backdrop-filter: blur(6px);
}
.proj-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.proj-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 8px;
}
.proj-desc {
  font-size: 0.875rem;
  color: #475569;
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}
.proj-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: #64748b;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}
.proj-footer strong {
  color: #0f172a;
}

/* 8. TEKLİF & DANIŞMANLIK KONSOLU */
.rfp-box {
  background-color: #1e2126;
  border-radius: 12px;
  padding: 50px;
  color: #ffffff;
  position: relative;
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.15);
}
.rfp-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 50px;
  align-items: center;
}
.rfp-left h3 {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  color: #ffffff;
}
.rfp-left p {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 26px;
}
.rfp-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.9375rem;
  color: #e2e8f0;
}
.rfp-contact-item strong {
  color: #fbbf24;
  min-width: 75px;
}
.rfp-form {
  background-color: #ffffff;
  border-radius: 8px;
  padding: 30px;
  color: #0f172a;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
.f-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}
.f-full {
  grid-column: span 2;
}
.form-input {
  width: 100%;
  background-color: #f8fafc;
  border: 1px solid var(--border-card);
  border-radius: 4px;
  padding: 12px 14px;
  color: #0f172a;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  outline: none;
  transition: var(--trans);
}
.form-input:focus {
  border-color: var(--gold-primary);
  background-color: #ffffff;
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.15);
}
.btn-submit-rfp {
  width: 100%;
  background-color: var(--gold-primary);
  color: #ffffff !important;
  border: none;
  padding: 15px;
  border-radius: 4px;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: var(--trans);
}
.btn-submit-rfp:hover {
  background-color: var(--gold-hover);
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.35);
}

/* 9. KURUMSAL FOOTER */
.site-footer {
  background-color: #141619;
  border-top: 3px solid var(--gold-primary);
  padding: 70px 0 30px 0;
  color: #94a3b8;
  font-size: 0.875rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 40px;
  margin-bottom: 50px;
}
.footer-logo {
  height: 48px;
  width: auto;
  margin-bottom: 20px;
  display: block;
}
.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #94a3b8;
  margin-bottom: 16px;
}
.footer-title {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  color: #fbbf24;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  color: #cbd5e1;
}
.footer-links a:hover {
  color: #fbbf24;
  padding-left: 4px;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8125rem;
}

/* RESPONSIVE */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .sys-card-row {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .rfp-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-item:nth-child(2) {
    border-right: none;
  }
}

@media (max-width: 768px) {
  .topbar {
    display: none;
  }
  .nav-list {
    display: none;
  }
  .brand-sub {
    display: none;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .process-grid {
    grid-template-columns: 1fr;
  }
  .f-grid {
    grid-template-columns: 1fr;
  }
  .f-full {
    grid-column: span 1;
  }
  .hero-stats {
    grid-template-columns: 1fr;
  }
  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 12px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}